I don't have enough time for it to do the calculations. On top of that there's still probably several hours if programming for it to figure it to even begin the calculation.
Then I'd say it would consume about the same amount as a 60W light bulb, give or take and HVAC unit ,or five.
It is pretty awesome when you think about it. It took hours, if not days to program that thing to just do simple math equations, was gigantic, and took huge amounts of energy to run and keep cool to just do multiplication. Now we have a small device in our pocket that, on top of destroying any math calculations thrown at it with minimal input by the user, can access essentially all the information known to the human race from nearly anywhere.